Commitments and Contingencies - Additional Information (Detail) (USD $)	1 Months Ended		12 Months Ended			1 Months Ended					1 Months Ended					12 Months Ended
	Jul. 31, 2012	Jan. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Jul. 31, 2012 Prejudgment Interest	Dec. 31, 2012 Eolas Technologies Incorporated Patent	Dec. 31, 2009 Nazomi Communications, Inc. Patent	Jul. 31, 2010 Positive Technologies Inc. Patent	Sep. 30, 2012 Olympic Developments AG, LLC Patent	Sep. 30, 2011 LVL Patent Group, LLC Patent	Sep. 30, 2011 Parallel Iron, LLC Additional patents Patent	Sep. 30, 2011 Droplets, Inc. Patent	Jul. 31, 2012 Technology Properties Limited Additional patents Patient	Jul. 31, 2011 GPNE Corp. Patent	Dec. 31, 2012 Maximum	May 31, 2012 Maximum Clouding Ip Limited Liability Company Patent	May 31, 2012 Minimum Clouding Ip Limited Liability Company Patent
Loss Contingencies [Line Items]
Rental expense under operating lease agreements			$ 541,000,000	$ 362,000,000	$ 225,000,000
Pledged or otherwise restricted cash and marketable securities as collateral			99,000,000	156,000,000
Inventory purchases by supplier			During 2012, no vendor accounted for 10% or more of our inventory purchases
Damages sought in complaint			Injunctive relief, unpaid taxes, interest, attorneys' fees, civil penalties of up to $10,000 per violation, and treble or punitive damages
Maximum compensatory damages sought per violation																10,000
Number of patents infringed							2	2	3	2	4	3	2	2	3		11	1
Plaintiff alleged damages to be paid	$ 42,000,000	$ 40,000,000				$ 17,000,000
Number of complaints filed											3